Cool! I'm expecting a public beta to test it out, so far it looks filled with improvements all over, I specially like the simplified way of drawing lines and sectors, it will make things A LOT easier when mapping for me, heh! <!-- s;) --><img src="{SMILIES_PATH}/icon_wink.gif" alt=";)" title="Wink" /><!-- s;) -->
As for other things I would expect, I hope it correctly shows 3d floor structures in 3d mode, with slopes and everything.
BTW, have you noticed that the way it's drawing textures right now is not correct? It seems to scale the textures to the size of the line instead of tiling it as the engine does.